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  1. #include <stdio.h>
  2. #include <math.h>
  3. #define STUDENTS 5
  4. #define EXAMS 3
  5.  
  6. typedef struct{
  7. 	int id;
  8. 	int math;
  9. 	int english;
  10. 	int physics;
  11. 	double ave;
  12. 	double std;
  13. }Grades;
  14.  
  15. int main(void) 
  16. {
  17. 	Grades data[] = { { 1,  65,  80,  95 },
  18. 	                  { 2,  70,  68,  75 },
  19. 	                  { 3,  60, 100,  63 },
  20. 	                  { 4, 100,  55,  74 },
  21. 	                  { 5,  90,  85, 100 } };
  22.  
  23. 	for(int i=0; i<STUDENTS; i++){
  24. 		data[i].ave = (data[i].math + data[i].english + data[i].physics) / EXAMS;
  25. 		data[i].std = sqrt( ( (data[i].math - data[i].ave)*(data[i].math - data[i].ave) + 
  26. 		                      (data[i].english - data[i].ave)*(data[i].english - data[i].ave) +
  27. 		                      (data[i].physics - data[i].ave)*(data[i].physics - data[i].ave)
  28. 		                      ) / EXAMS
  29. 		                     ); 
  30. 		 printf(" id %d : %.1f, %.1f\n", data[i].id, data[i].ave,data[i].std);                    
  31. 	}                 
  32.  
  33. 	return 0;
  34. }
  35.  
Success #stdin #stdout 0.01s 5320KB
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stdin
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Standard input is empty
stdout
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 id 1 : 80.0, 12.2
 id 2 : 71.0, 2.9
 id 3 : 74.0, 18.2
 id 4 : 76.0, 18.4
 id 5 : 91.0, 6.3
https://ideone.com/L9CSxd
language:
C (gcc 8.3)
created:
14 hours ago
visibility:
public

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